The Common Special Printing Technology in the Post-press Processing of Packaging (Part 2)

The use of UV screen inks to print frosted, refraction, ice, wrinkles and other effects on cigarette packs has greatly stimulated consumers' desire to purchase. However, due to the flat press screen printing method with low printing speed, slow ink curing speed, difficult to control printing quality, and large consumption of printing materials, it is unable to meet the needs of cigarette cartons for scale and mass production. High-speed rotary screen printing production line has high printing speed, high productivity, stable quality and low consumption of printing products. It has changed the traditional flat-press screen printing manual feeding and ink supply methods. It is suitable for high-speed automatic and large-scale mass production of fine folding. Paper box.

Web Rotation Screen printing uses a nickel metal round screen plate, a built-in doctor blade, and an automatic ink supply system. The doctor blade transfers the printing ink from the circular screen plate to the surface of the substrate supported by the impression cylinder. The entire printing process from paper feeding, ink supply, color registration, UV drying, etc. are fully controlled by the computer. The circular screen printing plate is electroformed, and the mesh holes are hexagonal shaped holes, and the entire mesh surface is even and thin, ensuring the stability and precision of the imprinting. Therefore, roll web screen printing can not only meet the requirements of special effects such as printing frosting and ice flowering, but also can be used for hot stamping holographic anti-counterfeit labels, embossing, and die-cutting molding. It is easy to realize high-speed automatic printing paper boxes. Since the round press and die cutting are line contact, the line pressure during die cutting is much lower than the contact pressure of the flat pressed surface, so the equipment power is small and the stability is good. Due to continuous rolling die cutting, high production efficiency, maximum die cutting speed up to 350 m/min, round press die cutting machine equipped with high-precision register device and die cutting phase adjustment device, can obtain quite high die cutting Accuracy.

Special glossy printing

Special glossy printing is a new type of printing technology that has become more popular in the packaging printing industry in recent years. Special glossy printing processes currently include metal luster printing, pearl printing, pearl luster printing, refractive printing, variable gloss printing, laser holographic iris printing, crystal luster printing, imitation metal etching printing and matte printing. Among them, metal luster printing uses aluminum foil metal composite paper with a more transparent ink to form a special metallic luster effect on the printed product. In pearl printing, the surface of the print is first coated with silver paste, followed by a very transparent ink, and the silver glitter reflects a pearlescent effect through the ink layer. Pearl sheen printing is printed using inks that incorporate mica particles, resulting in a glossy effect similar to that of pearls and shellfish. Refractive printing is the unique effect of using a refraction plate to imprint a picture on a printed article with a certain pressure to produce light refraction. Matte printing uses matte ink printing or ordinary ink printing and then covers the matting film, which can produce the weak luster feature of the enamel, so it also has a relatively safe anti-counterfeiting effect.

Security ink printing

Anti-counterfeit ink printing is one of the most important technical branches of anti-counterfeit technology. The features of such anti-counterfeiting technology are simple implementation, low cost, good concealment, bright colors, easy inspection (even hand-temperature changeable colors), and strong reproducibility. It is the preferred anti-counterfeiting technology for banknotes, tickets and trademarks. However, there are many factors that need to be taken into account when using ink technology to reasonably apply to anti-counterfeit packaging and achieve an ideal anti-counterfeiting effect, including selection of printing methods, selection of printing machines, processing of printed materials, use of ink base materials, etc. The level is very demanding.

Multi-color printing

Multi-color serial printing is also called cross-color printing. Generally, multi-color printing is used for letterpress printing. According to the requirements of printing products, ink is placed in ink tanks, and then inks of various hue are placed in different compartments. Under the string action of the skein roller, the adjacent ink is mixed and transmitted to the plate. With this printing process, multiple colors can be printed at one time and the middle transition is soft.

Since it is difficult to see the distance of the ink tank partition from the print, it can also play a certain anti-counterfeiting effect. When this process is used on large-area shading printing, its anti-counterfeiting effect is more prominent.

Magnetic die-cutting drum technology

Traditional round bale round die-cutting uses a one-piece die cutter. When the die cut size or pattern of the job is changed, the printer needs to re-customize the entire die drum.